package operation;

import Book.Book;
import Book.BookList;

import java.util.Scanner;

public class DelOperation implements IOPeration {
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书");

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书：");
        String name = scanner.nextLine();
        int pos = -1;
        int i=0;
        int currentSize = bookList.getUsedSize();
        for (; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if (book.getName().equals(name)) {
                pos = i;
                break;
            }
        }
        if (i==currentSize){
            System.out.println("没有你要删除的图书");
            return;
        }
        int j= pos;
        for (;j<bookList.getUsedSize()-1;j++){
            Book book = bookList.getBook(j+1);
            bookList.setBooks(j,book);
        }
        bookList.setBooks(j,null);
        bookList.setUsedSize(currentSize-1);
    }
}
